/* The lang_hooks data structure.
Copyright 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef GCC_LANG_HOOKS_H
#define GCC_LANG_HOOKS_H
/* This file should be #include-d after tree.h. */
struct diagnostic_context;
/* A print hook for print_tree (). */
typedef void (*lang_print_tree_hook) (FILE *, tree, int indent);
/* The following hooks are documented in langhooks.c. Must not be
NULL. */
struct lang_hooks_for_tree_inlining
{
tree (*walk_subtrees) (tree *, int *,
tree (*) (tree *, int *, void *),
void *, struct pointer_set_t*);
int (*cannot_inline_tree_fn) (tree *);
int (*disregard_inline_limits) (tree);
tree (*add_pending_fn_decls) (void *, tree);
int (*auto_var_in_fn_p) (tree, tree);
int (*anon_aggr_type_p) (tree);
bool (*var_mod_type_p) (tree, tree);
int (*start_inlining) (tree);
void (*end_inlining) (tree);
tree (*convert_parm_for_inlining) (tree, tree, tree, int);
};
struct lang_hooks_for_callgraph
{
/* The node passed is a language-specific tree node. If its contents
are relevant to use of other declarations, mark them. */
tree (*analyze_expr) (tree *, int *, tree);
/* Produce RTL for function passed as argument. */
void (*expand_function) (tree);
};
/* Lang hooks for management of language-specific data or status
when entering / leaving functions etc. */
struct lang_hooks_for_functions
{
/* Called when entering a function. */
void (*init) (struct function *);
/* Called when leaving a function. */
void (*final) (struct function *);
/* Called when entering a nested function. */
void (*enter_nested) (struct function *);
/* Called when leaving a nested function. */
void (*leave_nested) (struct function *);
/* Determines if it's ok for a function to have no noreturn attribute. */
bool (*missing_noreturn_ok_p) (tree);
};
/* The following hooks are used by tree-dump.c. */
struct lang_hooks_for_tree_dump
{
/* Dump language-specific parts of tree nodes. Returns nonzero if it
does not want the usual dumping of the second argument. */
bool (*dump_tree) (void *, tree);
/* Determine type qualifiers in a language-specific way. */
int (*type_quals) (tree);
};
/* Hooks related to types. */
struct lang_hooks_for_types
{
/* Return a new type (with the indicated CODE), doing whatever
language-specific processing is required. */
tree (*make_type) (enum tree_code);
/* Given MODE and UNSIGNEDP, return a suitable type-tree with that
mode. */
tree (*type_for_mode) (enum machine_mode, int);
/* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an
integer type with at least that precision. */
tree (*type_for_size) (unsigned, int);
/* Given an integer type T, return a type like T but unsigned.
If T is unsigned, the value is T. */
tree (*unsigned_type) (tree);
/* Given an integer type T, return a type like T but signed.
If T is signed, the value is T. */
tree (*signed_type) (tree);
/* Return a type the same as TYPE except unsigned or signed
according to UNSIGNEDP. */
tree (*signed_or_unsigned_type) (int, tree);
/* Given a type, apply default promotions to unnamed function
arguments and return the new type. Return the same type if no
change. Required by any language that supports variadic
arguments. The default hook aborts. */
tree (*type_promotes_to) (tree);
/* Register TYPE as a builtin type with the indicated NAME. The
TYPE is placed in the outermost lexical scope. The semantics
should be analogous to:
typedef TYPE NAME;
in C. The default hook ignores the declaration. */
void (*register_builtin_type) (tree, const char *);
/* This routine is called in tree.c to print an error message for
invalid use of an incomplete type. VALUE is the expression that
was used (or 0 if that isn't known) and TYPE is the type that was
invalid. */
void (*incomplete_type_error) (tree value, tree type);
/* Called from assign_temp to return the maximum size, if there is one,
for a type. */
tree (*max_size) (tree);
/* Nonzero if types that are identical are to be hashed so that only
one copy is kept. If a language requires unique types for each
user-specified type, such as Ada, this should be set to TRUE. */
bool hash_types;
};
/* Language hooks related to decls and the symbol table. */
struct lang_hooks_for_decls
{
/* Returns nonzero if we are in the global binding level. Ada
returns -1 for an undocumented reason used in stor-layout.c. */
int (*global_bindings_p) (void);
/* Insert BLOCK at the end of the list of subblocks of the
current binding level. This is used when a BIND_EXPR is expanded,
to handle the BLOCK node inside the BIND_EXPR. */
void (*insert_block) (tree);
/* Function to add a decl to the current scope level. Takes one
argument, a decl to add. Returns that decl, or, if the same
symbol is already declared, may return a different decl for that
name. */
tree (*pushdecl) (tree);
/* Returns the chain of decls so far in the current scope level. */
tree (*getdecls) (void);
/* Returns true when we should warn for an unused global DECL.
We will already have checked that it has static binding. */
bool (*warn_unused_global) (tree);
/* Obtain a list of globals and do final output on them at end
of compilation */
void (*final_write_globals) (void);
/* Do necessary preparations before assemble_variable can proceed. */
void (*prepare_assemble_variable) (tree);
/* True if this decl may be called via a sibcall. */
bool (*ok_for_sibcall) (tree);
/* Return the COMDAT group into which this DECL should be placed.
It is known that the DECL belongs in *some* COMDAT group when
this hook is called. The return value will be used immediately,
but not explicitly deallocated, so implementations should not use
xmalloc to allocate the string returned. (Typically, the return
value will be the string already stored in an
IDENTIFIER_NODE.) */
const char * (*comdat_group) (tree);
};
/* Language-specific hooks. See langhooks-def.h for defaults. */
struct lang_hooks
{
/* String identifying the front end. e.g. "GNU C++". */
const char *name;
/* sizeof (struct lang_identifier), so make_node () creates
identifier nodes long enough for the language-specific slots. */
size_t identifier_size;
/* Determines the size of any language-specific tcc_constant or
tcc_exceptional nodes. Since it is called from make_node, the
only information available is the tree code. Expected to abort
on unrecognized codes. */
size_t (*tree_size) (enum tree_code);
/* The first callback made to the front end, for simple
initialization needed before any calls to handle_option. Return
the language mask to filter the switch array with. */
unsigned int (*init_options) (unsigned int argc, const char **argv);
/* Callback used to perform language-specific initialization for the
global diagnostic context structure. */
void (*initialize_diagnostics) (struct diagnostic_context *);
/* Handle the switch CODE, which has real type enum opt_code from
options.h. If the switch takes an argument, it is passed in ARG
which points to permanent storage. The handler is responsible for
checking whether ARG is NULL, which indicates that no argument
was in fact supplied. For -f and -W switches, VALUE is 1 or 0
for the positive and negative forms respectively.
Return 1 if the switch is valid, 0 if invalid, and -1 if it's
valid and should not be treated as language-independent too. */
int (*handle_option) (size_t code, const char *arg, int value);
/* Return false to use the default complaint about a missing
argument, otherwise output a complaint and return true. */
bool (*missing_argument) (const char *opt, size_t code);
/* Called when all command line options have been parsed to allow
further processing and initialization
Should return true to indicate that a compiler back-end is
not required, such as with the -E option.
If errorcount is nonzero after this call the compiler exits
immediately and the finish hook is not called. */
bool (*post_options) (const char **);
/* Called after post_options to initialize the front end. Return
false to indicate that no further compilation be performed, in
which case the finish hook is called immediately. */
bool (*init) (void);
/* Called at the end of compilation, as a finalizer. */
void (*finish) (void);
/* APPLE LOCAL begin mainline */
/* Called at the end of the translation unit. */
void (*finish_file) PARAMS ((void));
/* APPLE LOCAL end mainline */
/* Parses the entire file. The argument is nonzero to cause bison
parsers to dump debugging information during parsing. */
void (*parse_file) (int);
/* Called immediately after parsing to clear the binding stack. */
void (*clear_binding_stack) (void);
/* Called to obtain the alias set to be used for an expression or type.
Returns -1 if the language does nothing special for it. */
HOST_WIDE_INT (*get_alias_set) (tree);
/* Called with an expression that is to be processed as a constant.
Returns either the same expression or a language-independent
constant equivalent to its input. */
tree (*expand_constant) (tree);
/* Called by expand_expr for language-specific tree codes.
Fourth argument is actually an enum expand_modifier. */
rtx (*expand_expr) (tree, rtx, enum machine_mode, int, rtx *);
/* Called by expand_expr to generate the definition of a decl. Returns
1 if handled, 0 otherwise. */
int (*expand_decl) (tree);
/* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
operation.
This preparation consists of taking the ordinary representation
of an expression expr and producing a valid tree boolean
expression describing whether expr is nonzero. We could simply
always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
but we optimize comparisons, &&, ||, and !.
The result should be an expression of boolean type (if not an
error_mark_node). */
tree (*truthvalue_conversion) (tree);
/* Hook called by safe_from_p for language-specific tree codes. It is
up to the language front-end to install a hook if it has any such
codes that safe_from_p needs to know about. Since same_from_p will
recursively explore the TREE_OPERANDs of an expression, this hook
should not reexamine those pieces. This routine may recursively
call safe_from_p; it should always pass `0' as the TOP_P
parameter. */
int (*safe_from_p) (rtx, tree);
/* Function to finish handling an incomplete decl at the end of
compilation. Default hook is does nothing. */
void (*finish_incomplete_decl) (tree);
/* Mark EXP saying that we need to be able to take the address of
it; it should not be allocated in a register. Return true if
successful. */
bool (*mark_addressable) (tree);
/* Hook called by staticp for language-specific tree codes. */
tree (*staticp) (tree);
/* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
DECL_NODE with a newly GC-allocated copy. */
void (*dup_lang_specific_decl) (tree);
/* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of
thing that the assembler should talk about, set
DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE.
Otherwise, set it to the ERROR_MARK_NODE to ensure that the
assembler does not talk about it. */
void (*set_decl_assembler_name) (tree);
/* Return nonzero if fold-const is free to use bit-field
optimizations, for instance in fold_truthop(). */
bool (*can_use_bit_fields_p) (void);
/* Nonzero if operations on types narrower than their mode should
have their results reduced to the precision of the type. */
bool reduce_bit_field_operations;
/* Nonzero if this front end does not generate a dummy BLOCK between
the outermost scope of the function and the FUNCTION_DECL. See
is_body_block in stmt.c, and its callers. */
bool no_body_blocks;
/* The front end can add its own statistics to -fmem-report with
this hook. It should output to stderr. */
void (*print_statistics) (void);
/* Called by print_tree when there is a tree of class tcc_exceptional
that it doesn't know how to display. */
lang_print_tree_hook print_xnode;
/* Called to print language-dependent parts of tcc_decl, tcc_type,
and IDENTIFIER_NODE nodes. */
lang_print_tree_hook print_decl;
lang_print_tree_hook print_type;
lang_print_tree_hook print_identifier;
/* Computes the name to use to print a declaration. DECL is the
non-NULL declaration in question. VERBOSITY determines what
information will be printed: 0: DECL_NAME, demangled as
necessary. 1: and scope information. 2: and any other
information that might be interesting, such as function parameter
types in C++. */
const char *(*decl_printable_name) (tree decl, int verbosity);
/* This compares two types for equivalence ("compatible" in C-based languages).
This routine should only return 1 if it is sure. It should not be used
in contexts where erroneously returning 0 causes problems. */
int (*types_compatible_p) (tree x, tree y);
/* Given a CALL_EXPR, return a function decl that is its target. */
tree (*lang_get_callee_fndecl) (tree);
/* Called by report_error_function to print out function name. */
void (*print_error_function) (struct diagnostic_context *, const char *);
/* Called from expr_size to calculate the size of the value of an
expression in a language-dependent way. Returns a tree for the size
in bytes. A frontend can call lhd_expr_size to get the default
semantics in cases that it doesn't want to handle specially. */
tree (*expr_size) (tree);
/* Convert a character from the host's to the target's character
set. The character should be in what C calls the "basic source
character set" (roughly, the set of characters defined by plain
old ASCII). The default is to return the character unchanged,
which is correct in most circumstances. Note that both argument
and result should be sign-extended under -fsigned-char,
zero-extended under -fno-signed-char. */
HOST_WIDE_INT (*to_target_charset) (HOST_WIDE_INT);
/* Pointers to machine-independent attribute tables, for front ends
using attribs.c. If one is NULL, it is ignored. Respectively, a
table of attributes specific to the language, a table of
attributes common to two or more languages (to allow easy
sharing), and a table of attributes for checking formats. */
const struct attribute_spec *attribute_table;
const struct attribute_spec *common_attribute_table;
const struct attribute_spec *format_attribute_table;
/* APPLE LOCAL begin kext identify vtables */
int (*vtable_p) (tree);
/* APPLE LOCAL end kext identify vtables */
/* Function-related language hooks. */
struct lang_hooks_for_functions function;
struct lang_hooks_for_tree_inlining tree_inlining;
struct lang_hooks_for_callgraph callgraph;
struct lang_hooks_for_tree_dump tree_dump;
struct lang_hooks_for_decls decls;
struct lang_hooks_for_types types;
/* Perform language-specific gimplification on the argument. Returns an
enum gimplify_status, though we can't see that type here. */
int (*gimplify_expr) (tree *, tree *, tree *);
/* Fold an OBJ_TYPE_REF expression to the address of a function.
KNOWN_TYPE carries the true type of the OBJ_TYPE_REF_OBJECT. */
tree (*fold_obj_type_ref) (tree, tree);
/* Return a definition for a builtin function named NAME and whose data type
is TYPE. TYPE should be a function type with argument types.
FUNCTION_CODE tells later passes how to compile calls to this function.
See tree.h for its possible values.
If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
the name to be called if we can't opencode the function. If
ATTRS is nonzero, use that for the function's attribute list. */
tree (*builtin_function) (const char *name, tree type, int function_code,
enum built_in_class bt_class,
const char *library_name, tree attrs);
/* APPLE LOCAL begin 4133801 */
void (*start_source_file) (int n, const char *s);
void (*end_source_file) (int n, const char *s);
/* APPLE LOCAL end 4133801 */
/* Whenever you add entries here, make sure you adjust langhooks-def.h
and langhooks.c accordingly. */
};
/* Each front end provides its own. */
extern const struct lang_hooks lang_hooks;
#endif /* GCC_LANG_HOOKS_H */